Ore-roasting furnace.



' 'No". 741,549. PATENTED 00T. 13, 190s.

J. ROGER. ORB. ROASTING' FURNACE. AIPLICIA'lN` FILED FEB. 13, 1903.

4 SHEETS-SHEET 2.

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PATENTBD I00T. 1s, 1903.

. J. ROGER. 4

"Nol 741,5491

ORBROASTING PURNACB.

4 SHEETS-SHEET 3.

APPLIUATION FILED IEB. 13. 1903.

No MODEL. l

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'ORE RoAsTING FURNAGE.

. APPLICATION FILED TBB. 13.. 1903.

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iro. 741,549.

UNITED A STATES rammed october 13, 190s.

JOHN ROGER, OE DENVER, COLORADO.

ORE-ROASTING FURNACE.

SPEGIFICATION forming part 0f Letters Patent No. 741,549, dated October13, 1903.

' Application filed February 13, 1903. Serial No. 143,232. (No model.)

To all whom it may concern,.- v

Be it known thatl, JOHN ROGER, a subject of the King of Great Britain,residing at Den- This invention relates to ore-roasting furnaces. ,Y

The object of the invention is to simplify the construction of thefurnace by eliminating the employment of the track-carrier and Y l Vingthrough which the rabble-arms 5 pass is rollers for supporting thestirring mechanism and in lie'ufther'eof provide a construction in whichthe entire stirring mechanism will be sustained on adjustable vbearingsmounted upon a central column.

VA further object is to dispose the driving mechanism in such manner lasto afford increased facility for access to the furnace for purposes ofrepairs and at the same time to simplify the construction of thefurnace.

Other and salient objects of the invention will appear inthespecification and claims'.

With the above and other objects in view, as will appear as the natureof the invention is better understood, the same consists in the novel.construction and combination of parts of an ore-roasting furnace, aswill be hereinafter fullyY described and claimed.

In the accompanying drawings, forming a part of this specification, andin which like numerals of reference indicate corresponding parts, thereare illustrated two forms of embodiment'of the invention capable ofcarrying the same into practical operation, it being understood that theelements therein exhibited may be varied as to shape, proportion,

and exact manner of assemblage without departing fromthe spirit thereof.

In the drawings, Figure 1 is a view in vertical section through a partof the furnace, and Fig. Ila is a similar View showing the other portionof the furnace, the t-wo views when combined exhibiting the completefurnace. Fig. 2 isa view in plan showing a slightly-modified form ofheating device. Fig. 3 is a View in plan showing the water-circulatingmechanism. Fig. 4 is a view in side elevationA showing more particularlythe shield for closing the opening in the muftles through which therabble-arms project.

Fig. 5 is a view in or lower surface 2 of the chamber.

'provement elevation, partly in section, showing the pillar forsupporting the stirring mechanism.

Fig. 6 is asimilar view of the lower portion of the pillar.

Referring to the drawings, 1 designates the annular chamber or muffle inwhich the ore is roasted, the same being placed on the hearth The chamber is closed by an inner wall 3 ,and an outer wall 4 andl has its topcovered by an a-rch, as p usual.

The inner wall of the furnace over the o pencarried on Z-segments6,5supported by I- beams 7 and rods 8. The furnace shown in Figs. 1 andla is adapted for indirect firing; butthis is not au essential featureof the imln this furnace the firing is done in the upper chamber ormuftle 9,"and the the arch over the roasting-hearth.

In the form of furnace shown in Fig. 2 provision is made for employinggas or oil for firing purposes, 10V designating the ringvheat is appliedto the ore by radiation from boxes, having Openings 11 therein to permit4 the injection of thevfuel into the firing-chamber, and the gas or VOilfuel will be delivered to the chambers by pipes not 'necessary to beshown.

Arranged centrally of thefurnace is a stationary column 12, which isrigidly supported upon a suitable foundation and extends upward andsupports the upper structure 13 of I-beams, which extend radially fromthe outy side wall 4 and rest on the column, the I- beams being bracedagainst lateral movement by stay-rods 13a, secured to the said beams andthe beams 13", and by stay-rods 13C, se-

i cured to the beams 13 and to the Z-segments, as clearly shown in Figs.1 and la." 'These beams are provided to carry the driving mechanism andVtheupper' inner wall of 'the furnace through the medium of theI-beams'17. Upon the column 12 is loosely fitted a' sleeve 15, havingextensions 14 to receive arms 16.

This sleeve is provided at its lower surfacev with a suitable metal step-bearin g 17', preferably of hard brass, supported by a ringpiece 18and an adjusting-ring 19, the latter Ico being carried onadjusting-screws 2O. The. parts 18 and 19 are stationary, and thus donot revolve with the sleeve 15, are adjustable vertically by means ofthe screws 20, and have a tilting or binnacle movement, so that thebearing 17 will at all times come within true alinement and contact withthe sleeve 15. The bearing 17' is set in a recess or well in the ring18, which acts as an oil-holder to supply the bearing with the properlubricant, and covering-strips 22 are provided, which are secured to thesleeve l5 and with flexible connections thereto, thus to prevententrance of dust or foreign matter into the oil holder or well.

On the projecting arms 16 of the sleeve 15 are secured brackets 23 forcarrying the rabble-arms proper, 5, the said brackets being providedwith loose adjustable caps. The rabble-arms are inserted in theextensions and properly secured therein and are provided with the usualstirrer-blades 25 for agitating the ore in the furnace.

On the upper portion of the revolving sleeve 15 is a large gear-Wheel26, which operates to revolve the rabbling mechanism. The rabble-armsare carried at a proper level by means of adjustable rods 27, extendingfrom the upper end of the revolving sleeve to the brackets 23. Securedbetween the brackets 23 is a circular ring 2S, extending from onebracket to the next succeeding one, and the said ring is provided topresent a support for the shield that covers the opening through` whichthe rabble-arms pass, the said ring being firmly secured to the bracketsat each point of contact. The ring 28 at frequent intervals is providedwith counterweights 29 and levers 30, these in turn supporting themetallic shield or strip 3l, above referred to.

The counterweights 29 are adjustable on the levers 30, as clearly shownin Fig. 3, in order to cause positive coaction between the shield andthe openings through which the rabblearms pass, thus in a certain mannerto prevent escape of gases and the like.

For the purpose of maintaining a suitable working temperature in thearmsa water circulation is provided therefor and comprises aWater-supply pipe 32, supported on the I- beams 13, said pipedischarging into a circular trough 33, revolving with the mechanism ofthe furnace. From this trough lead pipes 34, which are connected withthe stirrer-arms and with a pipe 35, extending to the farther end ofeach of the arms. It will be seen that water delivered through the pipe34 will return in the rabblearm and will be delivered back through thepipe 35, which also revolves with the mechanism, and thence passes intoa central trough 36, which is provided with a drain 37 for carrying othe hot water as it is delivered from the arms in the fur'nace.

The driving mechanism consists of spurpinions 38, which engage with thegear-wheel 26. These pinions are mounted on shafts 39, which are securedby suitable brackets to the stationary framework of the furnace and tothe I-beams 13. The shafts are further provided with bevel-gears 40,which are engaged by pinions 41, carried by the shaft 42, which latteris rotated by a shaft 43 through the medium of driving-pulleys 44. ItWill be seen that as the pulleys 44 are rotated by any suitable meansthe pinions 38 will impart to the gear-wheel 36 a revolving motion,which will be transmitted to the sleeve 15, arm 16, brackets 23, and tothe arms 24, carrying with them the water-trough 33 and the pipeconnections running therefrom. As the arms 24 revolve around the centralcolumn the ore in the hearth is stirred up in the manner usual tofurnaces of this construction, and the whole revolving mechanism will besup ported on the central rings 18 and 19 and the adjusting-screws 20,thereby dispensing entirely with all tracks and outside supports such ashave heretofore been employed in structures of this kind.

As before indicated, the exact method of heating this furnace isimmaterial, and in theform herein shown the heating-chamber 9 isprovided independently of the roastingchamber; so that the gases ofcombustion may not mix with the gases evolved from the ore in roasting.The gases of combustion are taken off at the flue 45, while the gasesfrom the roasted ore are taken off by the liuc 46, which connectsdirectly with the roastingchamber 1.

In providing furnaces for roasting material in which it is not necessaryto keep the gases apart the upper chamber or mufiie 9 may be dispensedwith and the gases of combustion be permitted to pass directly throughthe chamber 1 in contact with the ore being roasted. The hre-boxes andother appliances for heating purposes used in connection with thisfurnace may be of any of the Well-known forms, such as step or flatgrate fire-boxes, constructed to suit the fuel available and theconditions as they may exist at the point ofV operation.

In the operation of the furnace, oil, gas, or other fuel may be used tobring the roastingchamber up to the necessary temperature for roastingthe ore to be treated, this ore being delivered from a storage bin orhopper onto the hearth of the furnace by a. screw under feed mechanism47, the stirrer-arms 5 being made to revolve around the central columnand While passing through the ore will stir up the latter and carry itforward at each pass until it is carried through the Whole circuit ofthe furnace and delivered into an opening 48, which is made in thehearth of the furnace and from which the ore may be removed by the car,conveyer, or elevator, as the case may require.

The time -of exposure of the ore on the hearth of the furnace willdepend upon the speed of the revolving arms, and the character of thestirring or rabble blades on these arms will depend upon the characterof the ore to be treated.

To furnish access to the furnace for the purpose of barring out orremoving any in- ICO being adjusted with great nicety and in such manneras to positively insure proper operation in use. Moreover, by disposingthe driving mechanism as shown-that is to say, overheadaccess to theinterior of the furnace is rendered easy, and the necessity of takingdown any part of the furnace for the purpose of gaining access theretois thus entirely obviated.

Having thus described the invention, what I claim isl'. The combinationwith a circular furnace, of a column or pillar disposed concentricallythereof, a sleeve rotatably mounted upon the column, rabble mechanismhaving their inner portions supported by the sleeve, means for adjustingthe sleeve to raise and lower the outer portions of the rabblemechanism, and adjusting mechanism .connecting the upper portion of thesleeve and the outer portion of the rabble mechanism.

2. Thecombination withacircularfurnace, of a column or pillar disposedconcentrically thereof, a sleeve rotatably mounted upon the column,rabble mechanism supported wholly by the sleeve, and means for adjustingthe sleeve upon the column thus to raise or lower the outer ends of therabble mechanism.

3. The combination with a circular furnace, of a column or pillardisposed concentrically thereof, a sleeve rotatably mounted upon thecolumn, rabble mechanism supported by the sleeve, means for adjustingthe sleeve upon vthe column, and adjusting mechanism connecting theupper portion of the sleeve and the outer portion of the rabblemechanism.

u 4. The combination withacircularfurnace, of a column or pillararranged concentrically thereof, a sleeve rotatably mounted upon thecolumn, a bearing arranged at the lower portion of the column, anadjustable ring supporting the bearing, rabble mechanism carried by thesleeve, and stay-bolts or guy-rods connecting the upper portion of thesleeve and the outer portions of the rabble mechanism. Y

5. The combination withacircu-larfurnace, of a pillar arrangedconcentrically thereof, a stationary ring disposed near the lower por-vtion thereof,adj Listing-screws bearing against the under side of thering, a stationary bearing resting upon the said ring and provided witha depression constituting an oil-Well, a sleeve mounted upon the columnand working at its lower end in said well, means forI sealing the wellagainst entrance of extraneous material, rabble mechanism carried by thesleeve, and means for adjusting the outer ends of the rabble mechanismwith relation to the furnace.

6. The combination with a circular furnace, of a column or pillardisposed concentrically thereof, a sleeve adjustably mounted on thepillar and carrying a trough rotatable therewith, rabble-arms connectedwith the pillar, means for supplying water to the trough, water-feedpipes connecting the trough with the rabble-arms, and water-return pipesconnect- 8o ing With the rabble-arms and leading to a point ofdischarge. l 7. In-a furnace of the class described, the combinationwith a column supported concentrically of the furnace, of a sleevemount- 85 ed thereon, rabble-arms carried by the sleeve, and guy-rods orstay-bolts connecting the y upper portion of the sleeve with the outerportions of the arms, thereby to support the said outer portionsdirectly 'from the sleeve 9o' and obviating thereby the necessity of theemployment of underneath meansfor supporting said arms.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

JOHN ROGER. Witnesses:

JAMES HENDERSON, ALFRED W. PICK.

